Plant parasitic nematodes 19 Nematoda 15 Plant Pests, (New March 2000) 15 Plant pests 12 Pest control 10 Insect pests 8 Insects 8 Nematode control 8 Plant diseases 8 Plant pathogens 8 Taxonomy 8 Natural enemies 7 Taxonomy and Evolution 7 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 7 Biological Control 6 Biological control 6 Horticultural Crops, (New March 2000) 6 Chemical control 5 Fungi 5 Pathogens, Parasites and Infectious Diseases (Wild Animals), (New March 2000) 5 Plant Breeding and Genetics 5 Plant pathogenic fungi 5 Plant viruses 5 Anatomy and Morphology (Wild Animals), (New March 2000) 4 Biological control agents 4 Crop production 4 Cultural control 4 Entomopathogens 4 Environmental Pest Management 4 Host Resistance and Immunity 4